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  <title>PHP 5.3.x 的变化</title>

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  <h2 class="title">PHP 5.3.x 的变化</h2>
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   PHP 5.3.x 的大多数改进对现有代码没有影响。需要注意的是有<a href="migration53.incompatible.html" class="link">一些不兼容</a>和<a href="migration53.new-features.html" class="link">新功能</a>，在生产环境中切换 PHP 版本需要先行测试代码。
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   由更老的 PHP 版本进行升级，有一些可用的相关文档：
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     <a href="migration52.html" class="link">PHP 5.2.x 升级说明</a>.
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     <a href="migration51.html" class="link">PHP 5.1.x 升级说明</a>.
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    <span class="simpara">
     <a href="migration5.html" class="link">从 PHP 4 移植到 PHP 5</a>.
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 <div class="next" style="text-align: right; float: right;"><a href="migration53.incompatible.html">不向下兼容的变化</a></div>
 <div class="up"><a href="migration53.html">从 PHP 5.2.x 移植到 PHP 5.3.x</a></div>
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